You read that right. Mercury has been found in every fish tested from almost 300 streams over a 7-year period. Where is it coming from? Coal.

Here's a pretty terrifying statistic: 100 percent of the fish tested by the U.S. Geological Survey in nearly 300 streams were found to be contaminated with mercury.

Every single one.

Between 1998 and 2005 scientists tested over 1,000 fish from 291 streams across the country and found mercury in all of them. A quarter of the fish had more than the EPA thinks is safe for people to eat.

We can thank coal for this one. Mercury is found in coal and is released from power plant smoke stacks into the air. It eventually comes back down to earth in rain and other precipitation and travels through the food chain to collect in the fatty tissues of, apparently, every fish living in the United States (and any person eating those fish).

Shea Gunther is a podcaster, writer, and entrepreneur living in Portland, Maine. He hosts the popular podcast "Marijuana Today Daily" and was a founder of Renewable Choice Energy, the country's leading provider of wind credits and Green Options. He plays a lot of ultimate frisbee and loves bad jokes.